Greatly enhanced broadband near-infrared emission due to energy transfer from Cr 3+ to Ni 2+ in transparent magnesium al
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ARTICLES Greatly enhanced broadband near-infrared emission due to energy transfer from Cr3+ to Ni2+ in transparent magnesium aluminosilicate glass ceramics Jin Luo and Shifeng Zhou State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, People’s Republic of China
Botao Wu State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China
Hucheng Yang, Song Ye, and Bin Zhu State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, People’s Republic of China
Jianrong Qiua) State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, People’s Republic of China; and State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China (Received 16 March 2008; accepted 11 July 2008)
Cr3+/Ni2+ co-doped optically transparent magnesium aluminosilicate glass-ceramics containing MgAl2O4 nanocrystals have been prepared by heat-treatment. Greatly enhanced broadband near-infrared emission centered at 1216 nm in Cr3+/Ni2+ co-doped glass ceramics is observed when compared with the Ni2+ single-doped glass ceramics under 532 nm excitation. The observed enhancement of infrared emission is attributed to the energy transfer from Cr3+ to Ni2+ ions in the nanocrystalline phase, which leads to the emission due to 3T2(3F) ! 3A2(3F) transition of octahedral Ni2+ ions.
I. INTRODUCTION
In recent years, transparent glass ceramics, which can be prepared by precipitating nanocrystalline phase from a glass matrix through suitable heat treatment, have become very attractive materials for the photonic applications.1 The glass-ceramics are easily fabricated like glass and have crystal’s advantage of high optical activity. With the rapid development of optical communication, the limited bandwidth of traditional rare-earth-ion-doped fiber amplifiers will not meet the need of large-capacity information transmission because of the intrinsic electron transition characteristics of rare-earth ions. In comparison, transition metal ions may potentially show broadband luminescence, and it has been reported that Ni2+-doped MgO single crystal shows broadband nearinfrared emission. Unfortunately, difficult fabrication restricts its practical applications.2 Glass can be easily fabricated into the form of fiber. However, Ni2+ ions show weak or even no luminescence in glasses due to the strong nonradiative relaxation. Recently, research was carried out to prepare Ni2+-doped transparent glass a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/JMR.2009.0068
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J. Mater. Res., Vol. 24, No. 2, Feb 2009
ceramics. In glass ceramics, Ni2+ ions show broadband near-infrared luminescence with long fluorescent lifetime when incorporated into the crystal phase. Therefore, they have potential applications as gain materials for broadband optical amplifiers and tunable
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